PageTheme.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / PageTheme.cs / 1 / PageTheme.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI { 
 
    using System;
    using System.Collections; 
    using System.Collections.Specialized;
    using System.ComponentModel;
    using System.Globalization;
    using System.Web.UI.HtmlControls; 
    using System.Web.Util;
    using System.Xml; 
    using System.Security.Permissions; 

    internal class FileLevelPageThemeBuilder : RootBuilder { 

        /// 
        ///    [To be supplied.]
        ///  
        public override void AppendLiteralString(string s) {
            // Don't allow any literal contents at theme top level 
            if (s != null) { 
                if (!Util.IsWhiteSpaceString(s)) {
                    throw new HttpException(SR.GetString( 
                        SR.Literal_content_not_allowed, SR.GetString(
                        SR.Page_theme_skin_file), s.Trim()));
                }
            } 

            base.AppendLiteralString(s); 
        } 

        ///  
        ///    [To be supplied.]
        /// 
        public override void AppendSubBuilder(ControlBuilder subBuilder) {
            // Only allow controls at theme top level 
            Type ctrlType = subBuilder.ControlType;
            if (!typeof(Control).IsAssignableFrom(ctrlType)) { 
                throw new HttpException(SR.GetString( 
                    SR.Page_theme_only_controls_allowed, ctrlType == null ?
                    String.Empty : ctrlType.ToString())); 
            }

            // Check if the control theme type is themeable.
            if (InPageTheme && !ThemeableAttribute.IsTypeThemeable(subBuilder.ControlType)) { 
                throw new HttpParseException(SR.GetString(SR.Type_theme_disabled, subBuilder.ControlType.FullName),
                    null, subBuilder.VirtualPath, null, subBuilder.Line); 
            } 

            base.AppendSubBuilder(subBuilder); 
        }
    }

    [EditorBrowsable(EditorBrowsableState.Advanced)] 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    public abstract class PageTheme { 

        private Page _page; 
        private bool _styleSheetTheme;

        protected abstract String[] LinkedStyleSheets { get; }
 
        protected abstract IDictionary ControlSkins { get; }
 
        protected abstract String AppRelativeTemplateSourceDirectory { get; } 

        protected Page Page { 
            get {
                return _page;
            }
        } 

        internal void Initialize(Page page, bool styleSheetTheme) { 
            Debug.Assert(page != null); 
            _page = page;
            _styleSheetTheme = styleSheetTheme; 
        }

        protected object Eval(string expression) {
            return Page.Eval(expression); 
        }
 
        protected string Eval(string expression, string format) { 
            return Page.Eval(expression, format);
        } 

        public static object CreateSkinKey(Type controlType, String skinID) {
            if (controlType == null) {
                throw new ArgumentNullException("controlType"); 
            }
 
            return new SkinKey(controlType.ToString(), skinID); 
        }
 
        internal void ApplyControlSkin(Control control) {
            if (control == null) {
                throw new ArgumentNullException("control");
            } 

            ControlSkin skin = null; 
            String skinId = control.SkinID; 
            skin = (ControlSkin)ControlSkins[CreateSkinKey(control.GetType(), skinId)];
 
            // Don't throw if ControlSkin corresponds to the skinID does not exist.
            Debug.Assert(skin == null || skin.ControlType == control.GetType());

            if (skin != null) { 
                skin.ApplySkin(control);
            } 
        } 

        internal void SetStyleSheet() { 
            if (LinkedStyleSheets != null && LinkedStyleSheets.Length > 0) {
                if (Page.Header == null)
                    throw new InvalidOperationException(SR.GetString(SR.Page_theme_requires_page_header));
 
                int index = 0;
                foreach(string styleSheetPath in LinkedStyleSheets) { 
                    HtmlLink link = new HtmlLink(); 
                    link.Href = styleSheetPath;
                    link.Attributes["type"] = "text/css"; 
                    link.Attributes["rel"] = "stylesheet";

                    if (_styleSheetTheme) {
                        Page.Header.Controls.AddAt(index ++, link); 
                    }
                    else { 
                        Page.Header.Controls.Add(link); 
                    }
                } 
            }
        }

        public bool TestDeviceFilter(string deviceFilterName) { 
            return Page.TestDeviceFilter(deviceFilterName);
        } 
 
        protected object XPath(string xPathExpression) {
            return Page.XPath(xPathExpression); 
        }

        protected object XPath(string xPathExpression, IXmlNamespaceResolver resolver) {
            return Page.XPath(xPathExpression, resolver); 
        }
 
        protected string XPath(string xPathExpression, string format) { 
            return Page.XPath(xPathExpression, format);
        } 

        protected string XPath(string xPathExpression, string format, IXmlNamespaceResolver resolver) {
            return Page.XPath(xPathExpression, format, resolver);
        } 

        protected IEnumerable XPathSelect(string xPathExpression) { 
            return Page.XPathSelect(xPathExpression); 
        }
 
        protected IEnumerable XPathSelect(string xPathExpression, IXmlNamespaceResolver resolver) {
            return Page.XPathSelect(xPathExpression, resolver);
        }
 
        private class SkinKey {
            private string _skinID; 
            private string _typeName; 

            internal SkinKey(string typeName, string skinID) { 
                _typeName = typeName;

                if (String.IsNullOrEmpty(skinID)) {
                    _skinID = null; 
                }
                else { 
                    _skinID = skinID.ToLower(CultureInfo.InvariantCulture); 
                }
            } 

            public override int GetHashCode() {
                if (_skinID == null) {
                   return _typeName.GetHashCode(); 
                }
 
                return HashCodeCombiner.CombineHashCodes(_typeName.GetHashCode(), _skinID.GetHashCode()); 
            }
 
            public override bool Equals(object o) {
                SkinKey key = (SkinKey)o;

                return (_typeName == key._typeName) && 
                    (_skinID == key._skinID);
            } 
        } 
    }
}

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